From: ChiYuan Huang cy_huang@richtek.com
Adds support for Richtek RT4831 DSV Regulator
Signed-off-by: ChiYuan Huang cy_huang@richtek.com --- drivers/regulator/Kconfig | 10 ++ drivers/regulator/Makefile | 1 + drivers/regulator/rt4831-regulator.c | 198 +++++++++++++++++++++++++++++++++++ 3 files changed, 209 insertions(+) create mode 100644 drivers/regulator/rt4831-regulator.c
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 020a00d..3e875ad 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -931,6 +931,16 @@ config REGULATOR_RT4801 This adds support for voltage regulators in Richtek RT4801 Display Bias IC. The device supports two regulators (DSVP/DSVN).
+config REGULATOR_RT4831 + tristate "Richtek RT4831 DSV Regulators" + depends on MFD_RT4831 + help + This adds support for voltage regulators in Richtek RT4831. + There are three regulators (VLCM/DSVP/DSVN). + VLCM is a virtual voltage input for DSVP/DSVN inside IC. + And DSVP/DSVN is the real Vout range from 4V to 6.5V. + It's common used to provide the power for the display panel. + config REGULATOR_RT5033 tristate "Richtek RT5033 Regulators" depends on MFD_RT5033 diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 6ebae51..eb587d4 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -115,6 +115,7 @@ obj-$(CONFIG_REGULATOR_RK808) += rk808-regulator.o obj-$(CONFIG_REGULATOR_RN5T618) += rn5t618-regulator.o obj-$(CONFIG_REGULATOR_ROHM) += rohm-regulator.o obj-$(CONFIG_REGULATOR_RT4801) += rt4801-regulator.o +obj-$(CONFIG_REGULATOR_RT4831) += rt4831-regulator.o obj-$(CONFIG_REGULATOR_RT5033) += rt5033-regulator.o obj-$(CONFIG_REGULATOR_RTMV20) += rtmv20-regulator.o obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o diff --git a/drivers/regulator/rt4831-regulator.c b/drivers/regulator/rt4831-regulator.c new file mode 100644 index 00000000..3d4695d --- /dev/null +++ b/drivers/regulator/rt4831-regulator.c @@ -0,0 +1,198 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <linux/bitops.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/regulator/driver.h> + +enum { + DSV_OUT_VLCM = 0, + DSV_OUT_VPOS, + DSV_OUT_VNEG, + DSV_OUT_MAX +}; + +#define RT4831_REG_DSVEN 0x09 +#define RT4831_REG_VLCM 0x0c +#define RT4831_REG_VPOS 0x0d +#define RT4831_REG_VNEG 0x0e +#define RT4831_REG_FLAGS 0x0f + +#define RT4831_VOLT_MASK GENMASK(5, 0) +#define RT4831_DSVMODE_SHIFT 5 +#define RT4831_DSVMODE_MASK GENMASK(7, 5) +#define RT4831_POSADEN_MASK BIT(4) +#define RT4831_NEGADEN_MASK BIT(3) +#define RT4831_POSEN_MASK BIT(2) +#define RT4831_NEGEN_MASK BIT(1) + +#define RT4831_OTP_MASK BIT(6) +#define RT4831_LCMOVP_MASK BIT(5) +#define RT4831_VPOSSCP_MASK BIT(3) +#define RT4831_VNEGSCP_MASK BIT(2) + +#define DSV_MODE_NORMAL (0x4 << RT4831_DSVMODE_SHIFT) +#define DSV_MODE_BYPASS (0x6 << RT4831_DSVMODE_SHIFT) +#define STEP_UV 50000 +#define VLCM_MIN_UV 4000000 +#define VLCM_MAX_UV 7150000 +#define VLCM_N_VOLTAGES ((VLCM_MAX_UV - VLCM_MIN_UV) / STEP_UV + 1) +#define VPN_MIN_UV 4000000 +#define VPN_MAX_UV 6500000 +#define VPN_N_VOLTAGES ((VPN_MAX_UV - VPN_MIN_UV) / STEP_UV + 1) + +static int rt4831_get_error_flags(struct regulator_dev *rdev, unsigned int *flags) +{ + struct regmap *regmap = rdev_get_regmap(rdev); + int rid = rdev_get_id(rdev); + unsigned int val, events = 0; + int ret; + + ret = regmap_read(regmap, RT4831_REG_FLAGS, &val); + if (ret) + return ret; + + if (val & RT4831_OTP_MASK) + events |= REGULATOR_ERROR_OVER_TEMP; + + if (rid == DSV_OUT_VLCM && (val & RT4831_LCMOVP_MASK)) + events |= REGULATOR_ERROR_OVER_CURRENT; + + if (rid == DSV_OUT_VPOS && (val & RT4831_VPOSSCP_MASK)) + events |= REGULATOR_ERROR_OVER_CURRENT; + + if (rid == DSV_OUT_VNEG && (val & RT4831_VNEGSCP_MASK)) + events |= REGULATOR_ERROR_OVER_CURRENT; + + *flags = events; + return 0; +} + +static const struct regulator_ops rt4831_dsvlcm_ops = { + .list_voltage = regulator_list_voltage_linear, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_bypass = regulator_set_bypass_regmap, + .get_bypass = regulator_get_bypass_regmap, + .get_error_flags = rt4831_get_error_flags, +}; + +static const struct regulator_ops rt4831_dsvpn_ops = { + .list_voltage = regulator_list_voltage_linear, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + .set_active_discharge = regulator_set_active_discharge_regmap, + .get_error_flags = rt4831_get_error_flags, +}; + +static const struct regulator_desc rt4831_regulator_descs[] = { + { + .name = "DSVLCM", + .ops = &rt4831_dsvlcm_ops, + .of_match = of_match_ptr("DSVLCM"), + .regulators_node = of_match_ptr("regulators"), + .type = REGULATOR_VOLTAGE, + .id = DSV_OUT_VLCM, + .n_voltages = VLCM_N_VOLTAGES, + .min_uV = VLCM_MIN_UV, + .uV_step = STEP_UV, + .vsel_reg = RT4831_REG_VLCM, + .vsel_mask = RT4831_VOLT_MASK, + .bypass_reg = RT4831_REG_DSVEN, + .bypass_val_on = DSV_MODE_BYPASS, + .bypass_val_off = DSV_MODE_NORMAL, + }, + { + .name = "DSVP", + .ops = &rt4831_dsvpn_ops, + .of_match = of_match_ptr("DSVP"), + .regulators_node = of_match_ptr("regulators"), + .type = REGULATOR_VOLTAGE, + .id = DSV_OUT_VPOS, + .n_voltages = VPN_N_VOLTAGES, + .min_uV = VPN_MIN_UV, + .uV_step = STEP_UV, + .vsel_reg = RT4831_REG_VPOS, + .vsel_mask = RT4831_VOLT_MASK, + .enable_reg = RT4831_REG_DSVEN, + .enable_mask = RT4831_POSEN_MASK, + .active_discharge_reg = RT4831_REG_DSVEN, + .active_discharge_mask = RT4831_POSADEN_MASK, + }, + { + .name = "DSVN", + .ops = &rt4831_dsvpn_ops, + .of_match = of_match_ptr("DSVN"), + .regulators_node = of_match_ptr("regulators"), + .type = REGULATOR_VOLTAGE, + .id = DSV_OUT_VNEG, + .n_voltages = VPN_N_VOLTAGES, + .min_uV = VPN_MIN_UV, + .uV_step = STEP_UV, + .vsel_reg = RT4831_REG_VNEG, + .vsel_mask = RT4831_VOLT_MASK, + .enable_reg = RT4831_REG_DSVEN, + .enable_mask = RT4831_NEGEN_MASK, + .active_discharge_reg = RT4831_REG_DSVEN, + .active_discharge_mask = RT4831_NEGADEN_MASK, + } +}; + +static int rt4831_regulator_probe(struct platform_device *pdev) +{ + struct regmap *regmap; + struct regulator_dev *rdev; + struct regulator_config config = {}; + int i, ret; + + regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (IS_ERR(regmap)) { + dev_err(&pdev->dev, "Failed to init regmap\n"); + return PTR_ERR(regmap); + } + + /* Configure DSV mode to normal by default */ + ret = regmap_update_bits(regmap, RT4831_REG_DSVEN, RT4831_DSVMODE_MASK, DSV_MODE_NORMAL); + if (ret) { + dev_err(&pdev->dev, "Failed to configure dsv mode to normal\n"); + return ret; + } + + config.dev = pdev->dev.parent; + config.regmap = regmap; + + for (i = 0; i < DSV_OUT_MAX; i++) { + rdev = devm_regulator_register(&pdev->dev, rt4831_regulator_descs + i, &config); + if (IS_ERR(rdev)) { + dev_err(&pdev->dev, "Failed to register %d regulator\n", i); + return PTR_ERR(rdev); + } + } + + return 0; +} + +static const struct platform_device_id rt4831_regulator_match[] = { + { "rt4831-regulator", 0 }, + {} +}; +MODULE_DEVICE_TABLE(platform, rt4831_regulator_match); + +static struct platform_driver rt4831_regulator_driver = { + .driver = { + .name = "rt4831-regulator", + }, + .id_table = rt4831_regulator_match, + .probe = rt4831_regulator_probe, +}; +module_platform_driver(rt4831_regulator_driver); + +MODULE_AUTHOR("ChiYuan Huang cy_huang@richtek.com"); +MODULE_LICENSE("GPL v2");